mapAddressInternal

Override to map virtual recipients to real recipients, both local and
non-local. Each key in the provided map corresponds to a potential
virtual recipient, stored as a MailAddress object.
Translate virtual recipients to real recipients by mapping a string
containing the address of the real recipient as a value to a key. Leave
the value null
if no mapping should be performed. Multiple recipients may be specified by delineating
the mapped string with commas, semi-colons or colons.